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I was chatting with my kid about sources of energy available on Earth for power generation. We narrowed it down to just 4 sources: solar, geothermal, nuclear and tidal (fossil, wind, hydro and anything biological being forms of stored solar energy). I had trouble explaining where the work for tidal power is coming from -- are tidally moved masses of water taking that energy from Earth's rotational energy by slowing it down?

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@mansr well, I mean, I know gravity is involved, but gravity by itself cannot do work. What gives away energy when oceans rise and fall? It's got to be the Earth's rotational energy, because I can't see how it can be orbital speeds of Moon/Sun?

@mansr Aha. I mostly came to the same conclusion while reading about tidal locking.

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